|   variables  |       traits  |       frequency (n)  |       percent  |       M  |       SD  |    
|   sex  |       female  |       163  |       79%  |       1.81  |       0.397  |    
|   male  |       43  |       21%  |    |||
|   major  |       literal arts  |       155  |       75%  |       1.41  |       0.503  |    
|   science  |       51  |       25%  |    |||
|   college category  |       normal college  |       119  |       58%  |       1.25  |       0.433  |    
|   non-normal college  |       87  |       42%  |    |||
|   school rank  |       non-key college  |       198  |       96%  |       1.99  |       0.120  |    
|   key college  |       8  |       4%  |    |||
|   test anxiety  |       -  |       206  |       -  |       1.94  |       0.435  |    
|   positive meta-cognition  |       -  |       206  |       -  |       3.09  |       0.371  |    
|   negative meta-cognition  |       -  |       206  |       -  |       2.38  |       0.323  |